Hi,
You are not reading my post well either. I covered most of everything.
Usually battery is the first thing they replace without good reason.
When I investigated swapped out batteries, almost 80% was in good shape.
My brother(chemistry major) once worked in Exide battery plant. We
talked a lot about batteries. I live in very cold climate. Keeping a car
in good running order is a matter of life and dead in winter time.

OK, this may be true. However................................. since
they have *already* replaced the battery, and the problem is still there,
it's *NOT* the battery causing the problem!!!!!!! Why can't you
understand this???

Same problem on my wife's '07 Odyssey. First time was when it was parked at
the airport for 7 days during the summer. 2nd time was last week when we
returned after only being gone 5 days.
This morning my wife took it to the dealer and he said it was "normal".
Service writer said the "higher demands of the ECU drain the battery
quicker".
Tomorrow I am going to call him and if he sticks to that story I'll call
Honda regional and see what they have to say. The service writers answer
basically translates to "if you drive an Odyssey, you can't go on vacation".

The Dealership should be able to check the current draw on the battery with
the ignition off by placing an ammeter between the negative battery cable
and ground. They will be able to determine if the current draw observed is
normal or not. If it's too high then they have to disconnect circuits by
removing the fuses one at a time until they find the faulty one. If the draw
is normal then I also would suspect the altenator. Just my two cents.

Just an update. It seems they have found a phantom load that is discharging
the battery but they have yet to figure out exactly what it is. Since all
items are Honda installed and supplied they can't blame it on anything else.
The new battery (3 weeks old) is fine and they report the alternator is fine
as well.

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